Started with TFP early this month, working on CYA and alkalinity levels. CYA was too low to measure with the K2006. Last pool store test said 17. Added 4 lbs (in a sock) and it came to 27. 4 more and it was 44. 4 more and it's up to 63, 6 days ago. No additions this week so the filter could be backwashed. Tested this evening and it's down to 33. Tried 3 times.
I just got a new bottle of the test soln from TFTest (R0013, I think). Thought I used it for the 63 test (last log below), but that's been a while so it's possible that tonight was the first.
There have been no additions of water since adding about an inch 8 or 9 days ago following a backwash. The pool wasn't used this week, but the cover was open most days.
The only unusual event recently was cleaning behind the light. The back and niche were pretty slimy: white water mold is what we were told.
Any thoughts on what caused the drop?
Thanks
==========================================
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Build Type: Fiberglass
Volume: 14750 gallons
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Latest Test Result Summary:
FC: 7.4 (an hour ago)
CC: 0.4 (an hour ago)
pH: 7.2 (an hour ago)
TA: 145 (an hour ago)
CH: 380 (10 days ago)
CYA: 33 (an hour ago)
SALT: 3400 (19 days ago)
==========================================
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Chemical Addition 08-28-2021 @ 08:00 PM
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+ 48 FluidOunces of Baume31
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Test Results 08-28-2021 @ 07:45 PM
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Free Chlorine: 7.4
Combined Chlorine: 0.4
pH: 7.2
Total Alkalinity: 145
CYA: 33
------------------------------------------
Maintenance 08-28-2021 @ 07:30 PM
------------------------------------------
Backwashed
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Notes 08-28-2021 @ 12:02 PM
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I was away since 8/22. FC checked during the week with test strips. FC went to zero a couple of times. 3-4 gallons were added.
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Chemical Addition 08-28-2021 @ 12:01 PM
------------------------------------------
+ 48 FluidOunces of Baume31
------------------------------------------
Chemical Addition 08-28-2021 @ 11:45 AM
------------------------------------------
+ 128 FluidOunces of Bleach (10%)
------------------------------------------
Test Results 08-28-2021 @ 11:40 AM
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Free Chlorine: 2.0
Combined Chlorine: 0.3
pH: 7.4
------------------------------------------
Chemical Addition 08-22-2021 @ 10:42 AM
------------------------------------------
+ 32 FluidOunces of Baume31
------------------------------------------
Test Results 08-22-2021 @ 10:39 AM
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Free Chlorine: 6.0
Combined Chlorine: 0.4
pH: 7.2
Total Alkalinity: 160
CYA: 63
I just got a new bottle of the test soln from TFTest (R0013, I think). Thought I used it for the 63 test (last log below), but that's been a while so it's possible that tonight was the first.
There have been no additions of water since adding about an inch 8 or 9 days ago following a backwash. The pool wasn't used this week, but the cover was open most days.
The only unusual event recently was cleaning behind the light. The back and niche were pretty slimy: white water mold is what we were told.
Any thoughts on what caused the drop?
Thanks
==========================================
------------------------------------------
Build Type: Fiberglass
Volume: 14750 gallons
------------------------------------------
Latest Test Result Summary:
FC: 7.4 (an hour ago)
CC: 0.4 (an hour ago)
pH: 7.2 (an hour ago)
TA: 145 (an hour ago)
CH: 380 (10 days ago)
CYA: 33 (an hour ago)
SALT: 3400 (19 days ago)
==========================================
------------------------------------------
Chemical Addition 08-28-2021 @ 08:00 PM
------------------------------------------
+ 48 FluidOunces of Baume31
------------------------------------------
Test Results 08-28-2021 @ 07:45 PM
------------------------------------------
Free Chlorine: 7.4
Combined Chlorine: 0.4
pH: 7.2
Total Alkalinity: 145
CYA: 33
------------------------------------------
Maintenance 08-28-2021 @ 07:30 PM
------------------------------------------
Backwashed
------------------------------------------
Notes 08-28-2021 @ 12:02 PM
------------------------------------------
I was away since 8/22. FC checked during the week with test strips. FC went to zero a couple of times. 3-4 gallons were added.
------------------------------------------
Chemical Addition 08-28-2021 @ 12:01 PM
------------------------------------------
+ 48 FluidOunces of Baume31
------------------------------------------
Chemical Addition 08-28-2021 @ 11:45 AM
------------------------------------------
+ 128 FluidOunces of Bleach (10%)
------------------------------------------
Test Results 08-28-2021 @ 11:40 AM
------------------------------------------
Free Chlorine: 2.0
Combined Chlorine: 0.3
pH: 7.4
------------------------------------------
Chemical Addition 08-22-2021 @ 10:42 AM
------------------------------------------
+ 32 FluidOunces of Baume31
------------------------------------------
Test Results 08-22-2021 @ 10:39 AM
------------------------------------------
Free Chlorine: 6.0
Combined Chlorine: 0.4
pH: 7.2
Total Alkalinity: 160
CYA: 63